Due to limitations in the resource editor provided with Visual C++ 6.0, you will need to add an MFC project to your workspace and make it active so that you can add ActiveX controls to the Controls toolbar. Once the desired controls have been added to the Controls toolbar, you can switch back to your ATL project and edit the dialog resource using those controls. (An alternative approach is to design the whole dialog resource from within an MFC project then copy the resource to your ATL project).
See Also